Electronic Theses and Dissertation

Methyl orange berbahaya bagi kesehatan karena bersifat toksik dan mutagenik. Penurunan kadar zat warna methyl orange dalam lingkungan dapat melalui proses adsorpsi menggunakan adsorben CKH/Fe3O4/HA. Adsorben CKH/Fe3O4/HA memiliki kemampuan adsorpsi zat warna dikarenakan memiliki gugus hidroksil dan gugus karboksil serta bersifat magnetik yang mudah dikumpulkan dalam air. Tujuan adsorpsi dilakukan untuk menghilangkan zat warna pada limbah. Adsorben CKH/Fe3O4/HA terbuat dari hasil sintesis material mikro-nano magnetik abu cangkang kerang hijau, Fe3O4, dan asam humat. Karakteristik adsorben CKH/Fe3O4/HA menggunakan SEM dan FTIR. Hasil uji SEM menunjukkan banyak pori-pori yang terbentuk dengan luas permukaan terbesar 41.4 μm. Selain itu uji FTIR menunjukkan adanya gugus-gusus fungsi yang terdapat dalam adsorben CKH/Fe3O4/HA yang berperang aktif dalam proses penyerapan zat warna methyl orange seperti gugus karboksil (-COOH) dan gugus hidroksil (-OH). Adsorben CKH/Fe3O4/HA yang dihasilkan mampu menyerap methyl orange dalam larutan berair dengan kapasitas penyerapan 5,42 mg/g pada kondisi optimum yang terjadi pada pH 7, waktu kontak 80 menit, massa adsorben 0,4 g dan konsentrasi 5 mg/L. Pengujian isoterm adsorpsi dilakukan menggunakan isoterm Langmuir dan isoterm Freundlich dengan nilai R2 sebesar 0,997 dan diperoleh hasil bahwa jenis isoterm yang sesuai dengan proses adsorpsi methyl orange menggunakan adsorben CKH/Fe3O4/HA adalah isoterm Langmuir dengan nilai R2 yaitu 0,999.

Kata kunci: Cangkang kerang hijau, SEM, FTIR, Fe3O4, asam humat, adsorpsi, methyl orange

Methyl orange is dangerous for health because it is toxic and mutagenic. Reducing levels of methyl orange dye in the environment can be done through an adsorption process using CKH/Fe3O4/HA adsorbent. The CKH/Fe3O4/HA adsorbent has the ability to adsorb dyes because it has hydroxyl groups and carboxyl groups and is magnetic which is easy to collect in water. The purpose of adsorption is to remove dyes from waste. CKH/Fe3O4/HA adsorbent is made from the synthesis of magnetic micro-nano materials from green mussel shell ash, Fe3O4, and humic acid. Characteristics of CKH/Fe3O4/HA adsorbent using SEM and FTIR. SEM test results show that many pores are formed with the largest surface area of ​​41.4 μm. Apart from that, the FTIR test shows that there are functional groups contained in the CKH/Fe3O4/HA adsorbent which play an active role in the absorption process of methyl orange dye, such as the carboxyl group (-COOH) and the hydroxyl group (-OH). The resulting CKH/Fe3O4/HA adsorbent is capable of absorbing methyl orange in aqueous solution with an absorption capacity of 5.42 mg/g under optimum conditions which occur at pH 7, contact time 80 minutes, adsorbent mass 0.4 g and concentration 5 mg/L . Adsorption isotherm testing was carried out using the Langmuir isotherm and Freundlich isotherm with an R2 value of 0.997 and the results obtained were that the type of isotherm that is suitable for the methyl orange adsorption process using the CKH/Fe3O4/HA adsorbent is the Langmuir isotherm with an R2 value of 0.999. Key words: Green mussel shells, SEM, FTIR, Fe3O4, humic acid, adsorption, methyl orange